import {
    ref,
    onUnmounted
} from 'vue'
import {
    onHide,
    onUnload
} from '@dcloudio/uni-app'
import config from '@/config'
import PiperTTS from './piper-bundle.js'

export function useTTSPlayer() {
    // UI 状态
    const isSpeaking = ref(false) // 是否正在交互（含播放、暂停、加载）
    const isPaused = ref(false) // 是否处于暂停状态
    const isLoading = ref(false) // 是否正在加载/连接

    // 单例 Piper 实例
    let piper = null

    /**
     * 获取或创建 SDK 实例
     */
    const getPiperInstance = () => {
        if (!piper) {
            let baseUrl = config.speechSynthesis2 || ''
            baseUrl = baseUrl.replace(/\/$/, '')

            piper = new PiperTTS({
                baseUrl: baseUrl,
                sampleRate: 16000,
                onStatus: (msg, type) => {
                    if (type === 'error') {
                        console.error('[TTS Error]', msg)
                        resetState()
                    }
                },
                onStart: () => {
                    isLoading.value = false
                    isSpeaking.value = true
                    isPaused.value = false
                },
                onEnd: () => {
                    // 只有非暂停状态下的结束，才重置所有状态
                    // 如果是用户手动暂停导致的中断，不应视为自然播放结束
                    isSpeaking.value = false
                    isLoading.value = false
                    isPaused.value = false
                }
            })
        }
        return piper
    }

    /**
     * 核心朗读方法
     */
    const speak = async (text) => {
        if (!text) return

        const processedText = extractSpeechText(text)
        if (!processedText) return

        const instance = getPiperInstance()

        // 重置状态
        isLoading.value = true
        isPaused.value = false
        isSpeaking.value = true

        try {
            // 直接调用 speak，SDK 内部会自动处理 init 和 stop
            await instance.speak(processedText, {
                speakerId: 0,
                noiseScale: 0.667,
                lengthScale: 1.0
            })
        } catch (e) {
            console.error('TTS Speak Error:', e)
            resetState()
        }
    }

    /**
     * 暂停
     */
    const pause = async () => {
        // 1. 只有正在播放且未暂停时，才执行暂停
        if (!isSpeaking.value || isPaused.value) return

        // 2. 检查播放器实例是否存在
        if (piper && piper.player) {
            try {
                // 执行音频挂起
                await piper.player.pause()
                // 3. 成功后更新 UI
                isPaused.value = true
            } catch (e) {
                console.error("Pause failed:", e)
                // 即使报错，如果不是致命错误，也可以尝试强制更新 UI
                // isPaused.value = true 
            }
        }
    }

    /**
     * 恢复 (继续播放)
     */
    const resume = async () => {
        // 1. 只有处于暂停状态时，才执行恢复
        if (!isPaused.value) return

        if (piper && piper.player) {
            try {
                await piper.player.continue()
                // 2. 成功后更新 UI
                isPaused.value = false
                isSpeaking.value = true
            } catch (e) {
                console.error("Resume failed:", e)
            }
        }
    }

    /**
     * 切换 播放/暂停 (方便按钮绑定)
     */
    const togglePlay = () => {
        if (isPaused.value) {
            resume()
        } else {
            pause()
        }
    }

    /**
     * 停止 (中断)
     */
    const stop = () => {
        if (piper) {
            piper.stop()
        }
        resetState()
    }

    /**
     * 彻底销毁
     */
    const destroy = () => {
        if (piper) {
            piper.stop()
            piper = null
        }
        resetState()
    }

    const resetState = () => {
        isSpeaking.value = false
        isPaused.value = false
        isLoading.value = false
    }

    // === 生命周期管理 ===

    onUnmounted(destroy)

    if (typeof onHide === 'function') {
        onHide(() => {
            togglePlay()
            // stop()
        })
    }

    if (typeof onUnload === 'function') {
        onUnload(destroy)
    }

    return {
        speak,
        pause,
        resume,
        togglePlay, // 新增：单按钮切换功能
        stop,
        cancelAudio: stop,
        isSpeaking,
        isPaused,
        isLoading
    }
}

/**
 * 文本提取工具函数 (保持原样)
 */
function extractSpeechText(markdown) {
    if (!markdown || markdown.indexOf('job-json') === -1) {
        return markdown;
    }
    const jobRegex = /``` job-json\s*({[\s\S]*?})\s*```/g;
    const jobs = [];
    let match;
    let lastJobEndIndex = 0;
    let firstJobStartIndex = -1;
    while ((match = jobRegex.exec(markdown)) !== null) {
        const jobStr = match[1];
        try {
            const job = JSON.parse(jobStr);
            jobs.push(job);
            if (firstJobStartIndex === -1) {
                firstJobStartIndex = match.index;
            }
            lastJobEndIndex = jobRegex.lastIndex;
        } catch (e) {
            console.warn('JSON 解析失败', e);
        }
    }
    const guideText = firstJobStartIndex > 0 ?
        markdown.slice(0, firstJobStartIndex).trim() : '';
    const endingText = lastJobEndIndex < markdown.length ?
        markdown.slice(lastJobEndIndex).trim() : '';
    const jobTexts = jobs.map((job, index) => {
        return `第 ${index + 1} 个岗位，岗位名称是：${job.jobTitle}，公司是：${job.companyName}，薪资：${job.salary}，地点：${job.location}，学历要求：${job.education}，经验要求：${job.experience}。`;
    });
    const finalTextParts = [];
    if (guideText) finalTextParts.push(guideText);
    finalTextParts.push(...jobTexts);
    if (endingText) finalTextParts.push(endingText);
    return finalTextParts.join('\n');
}